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<p>我对使用对数颜色缩放的等高线图有问题。我想手动指定级别。然而,Matplotlib以一种奇怪的方式绘制颜色条——标签放置得不好,只有一种颜色出现。这个想法是基于
<a href="http://adversus.110mb.com/?cat=8" rel="noreferrer">http://adversus.110mb.com/?cat=8</a></p>
<p>有谁能帮我吗?
我使用最新的git存储库matplotlib版本v1.1.0(2011-04-21)</p>
<pre><code>import matplotlib.pyplot as plt
import numpy as np
from matplotlib.mlab import bivariate_normal
from matplotlib.colors import LogNorm
from matplotlib.backends.backend_pdf import PdfPages
delta = 0.5
x = np.arange(-3.0, 4.001, delta)
y = np.arange(-4.0, 3.001, delta)
X, Y = np.meshgrid(x, y)
Z = bivariate_normal(X, Y, 1.0, 1.0, 0.0, 0.0)
fig = plt.figure()
ax = fig.add_subplot(1,1,1)
#axim = ax.imshow(Z, norm = LogNorm())
axim = ax.contourf(X,Y,Z,levels=[1e0,1e-1,1e-2,1e-3],cmap=plt.cm.jet,norm = LogNorm())
cb = fig.colorbar(axim)
pp = PdfPages('fig.pdf')
pp.savefig()
pp.close()
plt.show()
</code></pre>
<p>非常感谢你的帮助!它工作得很好,正如你所建议的。。。
但是,我还有一个问题:为什么matplotlib不允许我在对数模式下选择层数:</p>
<pre><code>import matplotlib.pyplot as plt
import numpy as np
from matplotlib.mlab import bivariate_normal
from matplotlib.colors import LogNorm
from matplotlib.backends.backend_pdf import PdfPages
delta = 0.5
x = np.arange(-3.0, 4.001, delta)
y = np.arange(-4.0, 3.001, delta)
X, Y = np.meshgrid(x, y)
Z = bivariate_normal(X, Y, 1.0, 1.0, 0.0, 0.0)
fig = plt.figure()
ax = fig.add_subplot(1,1,1)
#axim = ax.imshow(Z, norm = LogNorm())
#axim = ax.contourf(X,Y,Z,levels=[1e-3,1e-2,1e-1,1e0],cmap=plt.cm.jet,norm = LogNorm())
axim = ax.contourf(X,Y,Z,20,cmap=plt.cm.jet,norm = LogNorm())
cb = fig.colorbar(axim)
pp = PdfPages('fig.pdf')
pp.savefig()
pp.close()
plt.show()
</code></pre>
<p><a href="https://i.stack.imgur.com/VeVFQ.png" rel="noreferrer">http://i.stack.imgur.com/VeVFQ.png</a></p>
<p>这是我最初的问题。。。</p>